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It isn't so much that it is important not to do so as much as it not being helpful if you do. If your operating system is crashed, then how can you read the critical system files from any external media? So backing up such files may not be helpful. However, if you do back them up in an easily readable format, you might be able to enter the console ("DOS") mode and manually copy specific critical files by hand and fix the problem.

Another possible problem is if you back up the system files, do a Windows update, and then restore the out of date system files over top of the newer ones while restoring user data. This not only puts the older files back and causes whatever vulnerabilities or problems that were fixed, but also cause confusion for the Windows Update process. The system may report the correct files but you have the incorrect files. Plus if you get a mixture of new and old system files, instability or crashes may occur.

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9y ago

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